An optical fiber coupling device includes a first optical fiber connector having a light source; and a second optical fiber connector matched with the first optical fiber connector by pull and plug. The second optical fiber connector includes a light sensor. The light sensor records a predetermined light level as a reference when the second optical fiber connector is at a aligned position to the first optical fiber connector, and is capable of detecting an incident light level, thereby showing that whether the second optical fiber connector is at the aligned position to the first optical fiber connector by compare of the incident light level and the reference.